Your incorrect answers were 3 and 4.
For number 3, the correct answer is b. This is because not language is not necessarily oral (i.e. there are written languages).
For number 4, the correct answer is b. Although comparative linguistics is a branch of historical linguistics, comparative linguistics is specifically concerned with comparing the linguistics of one person/place from the next.
By the time of the American Revolution (1775–83), American writers had ventured beyond the Puritan literary style and its religious themes and had developed styles of writing that grew from distinctly American
A group of friends talk about their would be reactions under different circumstances with the conditional or the imperfect subjunctive of the verbs in parentheses.
Jonah: If I were to fall from a cliff, I would make sure to carry a parachute with me.
Nick: In case, it does not rain tomorrow, I would love to take you to the cliff.
Sona: If I were at your place Jonah, I would never even consider to go near to any cliff as I am afraid of heights, you know.
The Imperfect Subjunctive expresses "the same subjunctivity as the Present Subjunctive but in the Past". It is not a tense. It adheres to the same guidelines but makes reference to prior knowledge, unexpected occurrences, or potential outcomes.
To learn more about imperfect subjunctive here
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